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Information about STEREO-A close approach to Earth, August 2023

Positions of STEREO A and B for 28-Apr-2024 19:00 UT

This figure plots the current positions of the STEREO Ahead (red) and Behind (blue) spacecraft relative to the Sun (yellow) and Earth (green). The dotted lines show the angular displacement from the Sun. Units are in A.U.

When the two spacecraft are close to Earth, an expanded view of the region around Earth will appear on the right, in the same orientation as the Sun-centered view.

Other resources:

• STEREO Orbit Tool
• STEREO-A Fly-by Orbit Tool for Summer 2023
• STEREO-A roll angle during Fly-By
• STEREO orbit simulations
• Satellite Situation Center (SSCWeb)
• HelioWeb
• Attitude and orbit text files (CalTech)
• Early orbit summary
• Connections with Parker Solar Probe
• Explanation of coordinate systems

                                STEREO-B           Earth        STEREO-A       Parker SP   Solar Orbiter     BepiColombo

Heliocentric distance (AU)      1.034304        1.006965        0.957607        0.681477        0.562387        0.469431
Semidiameter (arcsec)            927.801         952.990        1002.110        1408.158        1706.349        2044.236

HCI longitude                    127.178         143.091         154.638         242.509         302.276         239.746
HCI latitude                      -5.908          -4.367          -3.080           3.447           7.994           0.433

Carrington longitude              85.744         101.657         113.204         201.076         260.842         198.312
Carrington rotation number      2283.762        2283.718        2283.686        2283.441        2283.275        2283.449

Heliographic (HEEQ) longitude    -15.913           0.000          11.547          99.418         159.185          96.655
Heliographic (HEEQ) latitude      -5.908          -4.367          -3.080           3.447           7.994           0.433

HAE longitude                    202.713         218.636         230.230         318.288          17.709         315.339

Earth Ecliptic (HEE) longitude   -15.923          -0.000          11.594          99.653         159.073          96.703
Earth Ecliptic (HEE) latitude     -0.120           0.000           0.036          -2.990           1.851          -5.829

Roll from ecliptic north          -0.425                          -0.179
Roll from solar north             -4.799                          -6.728

Light travel time to Earth (min)           2.362           1.700                  10.871          12.852           9.643

Separation angle with Earth               15.923          11.594                  99.639         158.995          96.669
Separation angle A with B                         27.517

Carrington rotation 2283 runs from 2024-04-09 05:32 (DOY 100.23) to
2024-05-06 11:35 (DOY 127.48), as seen from Earth.

Last Revised: Sunday, 28-Apr-2024 19:01:06 UTC
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